exam Maths Puzzle Numerical Ability

2 times sq. root of x minus sq. root of 2x+1=1

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exam Other Question

Here is a tiring problem. The diameter of a car tire is approximately 60 centimeters. The warranty is good for 70,000 km. About how many revolutions will the tire make before the warranty is up? More than a million? A billion? i am having trouble understanding these types of questions..can you help?

length of the major axis of the ellipse 3x^2+2y^2=6 is __________?

this is a problem we had in our class to be reviewed tomorrow..thanks.